[html5] section vrs article

Hi,
Sorry if this is obvious but which of the following is the more correct?
Example A.
<section>
<header>
<h1>Apples</h1>
<p>Tasty, delicious fruit!</p>
</header>
<article>
The apple is the pomaceous fruit of the apple tree,
species Malus domestica in the rose family Rosaceae.
</article>
</section>
Example B.
<article>
<header>
<h1>Apples</h1>
<p>Tasty, delicious fruit!</p>
</header>
<section>
The apple is the pomaceous fruit of the apple tree,
species Malus domestica in the rose family Rosaceae.
</section>
</article>
Example C.
<article>
<header>
<h1>Apples</h1>
<p>Tasty, delicious fruit!</p>
</header>
<article>
The apple is the pomaceous fruit of the apple tree,
species Malus domestica in the rose family Rosaceae.
</article>
</article>
--
Stephen Stewart
www.carisenda.com